Direct link to source: https://www.reddit.com/r/BaldursGate3/comments/182fwlh/i_finally_figured_out_what_is_written_on_karlachs
Note that no real proof or breakdown is actually given.
This is an article reporting on absolutely nothing.
this post was submitted on 24 Nov 2023
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For those wondering, someone translated this from the Infernal scribed on her horn.
"My champion, the Demonsbane. My blood is her strength!"
Karlach also has Zariel tattooed on her body among other things.
https://www.reddit.com/r/BaldursGate3/comments/182fwlh/comment/kaiigcv/
Where's the proof, though?
It's Infernal. The language is detailed in the adventure module Descent Into Avernus. You can also just find the infernal alphabet on the forgotten realms wiki. 
That is to say that it's very possible to translate it. Now as to whether OP's translation is accurate or not, i have no idea, cause i have better things to do than read fake text out of an NPCs horn.
Wow, thanks for the follow up
OP posts lots of articles that have little substance to many subs, not surprised in the least
To be fair though, they do post a lot of quality too. Seems they should slow down and read what they post a little more carefully
I read the article. I read everything I post first.
But don’t worry. I won’t waste your time by posting here anymore.
A lot of people have been hyper critical about the content people have been posting, and even more upset when it's one person posting a lot. I don't know where they expect to get content from.
Especially since the people who seem to complain the most never post anything themselves.
Girl was stopped
You can waste my time by posting here, I've seen many of your contributions and I greatly appreciate your efforts. I don't usually say anything though. That other guy can fuck off.
Please keep posting things. I haven't sat down to translate it myself, but you can find plenty of charts online for the Infernal alphabet. There is absolutely no reason to believe this is made up when so much D&D information is out there.